Try not to send directly from the exchange. Best is to you first and then to the system or Alfred. To keep an easy track. But if you are withdrawing from BitMEX, then do this, when it is like 20 minutes before BitMEX sends withdrawals, simply then go and generate the new wallet where the system wants you to send the coins to. That is I think your own wallet at BW so no problems, it will automatically identify it and later give you the access to the group.